Jaap, thank you for taking this up but I'm not sure whether your answer
helps--yes, I can find notes within chords because they are branches of
EventChord, but those same notes also occur as individual NoteEvent
events *before* the EventChord event. If I'm trying to extract or
otherwise process only notes that *don't* belong to any chord, waiting
for the ChordEvent that follows and then backtracking would be complicated.
I should think I could check some property of a NoteEvent ("parent" or
"chord" would be nice). So is there any way to tell that a note is
*not* a branch (a leaf?) on any EventChord event?
Notice that I'm using "music-map" to get a list of the events, and the
list it generates includes chord notes twice: first as separate
NoteEvents and then again as members of the Chord of which they are
branches/members. If there's no simple way to look at a NoteEvent and
tell whether it is part of a chord, maybe there's a different way to
get a list of music events that doesn't have this duplication of chord
notes. Or maybe there's a different way entirely to approach the problem
of processing/extracting non-chord notes.
Thanks for pointing out ContextSpeccedMusic.
lilyp...@de-wolff.org wrote on 11/27/2019 8:45 AM:
Steve,
When you see the music expression as a tree, then the NoteEvent’s
belonging to a chord are branches of an EventChord.
This is for all chords including <a c>4 etc.
And as an extra bonus:
When you have chords like “c:7+” the EventChord’s are branches (or
sub-branches) of an ContextSpeccedMusic event with the music-attribute
‘context-type’ = “ChordsName”
Jaap
*Van:*lilypond-user
<lilypond-user-bounces+lilypond=de-wolff....@gnu.org> *Namens *Steve
Cummings
*Verzonden:* Tuesday, November 26, 2019 7:31 PM
*Aan:* lilypond-user@gnu.org
*Onderwerp:* Identifying non-chord notes in Scheme
What's the test for differentiating between non-chord notes and notes
within a chord, when iterating through events in music? I can examine
the notes within a chord individually, but I can't been able to find
the way to capture notes that don't belong to a chord (or
alternatively, to discard note events do belong to a chord).
Leaning heavily on code from Giles T, here's a simple routine that
displays pitches of note events when they are encountered as such, and
also when they occur within a chord. If the goal is to process
non-chord notes only, how can I pick them out? In the listing below
I've marked relevant places with "<<--"
Thanks,
Steve
\version "2.19"
#(use-modules (ice-9 receive)) %% so 'receive' can be used
#(define (noteEvent? music)
(eq? (name-of music) 'NoteEvent))
#(define (name-of music)
" (display-scheme-music (ly:music-property music 'name))"
(ly:music-property music 'name)
)
#(define* (music-to-console music #:optional (strict-comp? #t))
(music-map
(lambda(mus)
(display (name-of mus))
(newline)
(cond
((eq? 'EventChord (name-of mus))
(display "Chord")(newline)
(receive (notes others)
(partition noteEvent? (ly:music-property mus 'elements))
<<--Examine different music property?
(map(lambda(note)(display (ly:music-property note 'pitch)))
notes) (newline)))
((eq? 'NoteEvent (name-of mus)) <<----- Test here?
(display "A note event, but does it stand alone, or is it part
of a chord?") <<----- or here?
(newline) (display (ly:music-property mus 'pitch))(newline))
(else (display "(Not a note or a chord)")(newline))
)
(newline)
#{
#mus
#})
music))
showNotesAndChords = #(define-music-function (music) (ly:music?)
(music-to-console music #t))
someNotes = \transpose c f { <g b d'>4 c'4 d'4 \transpose f c {<f' a'
c''>2 c'}}
\showNotesAndChords \someNotes
